ANTENNA PRODUCTS CORPORATION LPH-27

The LPH-27 is a broadband, log periodic antenna which is steerable in azimuth. The array is tilted with respect to ground to provide slowly varying elevation patterns with frequency.

Characteristics

The array is mounted on top of a 50-foot selfsupporting tower. The front (higher frequency end) of the antenna is 30 feet above ground. The array is inclined at an angle of 22° with respect to the horizontal. The HF antenna array consists of the main support structure (boom) twenty tapered tubular elements, a twin feedline, and a transformer. The boom is an all-aluminum tower section laced with tubular diagonal braces and assembled with high-strength galvanized steel hardware. The twenty elements varying in length log-periodically, are all-aluminum tapered tubes. The rotator is mounted near the top of the tower with work platforms provided for easy maintenance. The input impedance of the antenna is 80 ohm. A transformer is used to match this impedance to 50 ohm. A rotary joint allows continuous rotation.